Cinnabar

Cinnabar (/ˈsɪnəbɑːr/) or cinnabarite (/sɪnəˈbɑːraɪt/), likely deriving from the Ancient Greek: κιννάβαρι[6] (kinnabari), is the bright scarlet to brick-red form of mercury(II) sulfide (HgS). It is the most common source ore for refining elemental mercury, and is the historic source for the brilliant red or scarlet pigment termed vermilion and associated red mercury pigments.

For other uses, see Cinnabar (disambiguation).
Cinnabar
General
CategorySulfide mineral
Formula
(repeating unit)		Mercury(II) sulfide, HgS
Strunz classification2.CD.15a
Crystal systemTrigonal
Crystal classTrapezohedral (32)
(same H–M symbol)
Space groupP3121, P3221
Unit cella = 4.145(2) Å, c = 9.496(2) Å, Z = 3
Identification
ColorCochineal-red, towards brownish red and lead-gray
Crystal habitRhombohedral to tabular; granular to massive and as incrustations
TwinningSimple contact twins, twin plane {0001}
CleavagePrismatic {1010}, perfect
FractureUneven to subconchoidal
TenacitySlightly sectile
Mohs scale hardness2.0–2.5
LusterAdamantine to dull
StreakScarlet
DiaphaneityTransparent in thin pieces
Specific gravity8.176
Optical propertiesUniaxial (+)
Refractive indexnω = 2.905 nε = 3.256
Birefringenceδ = 0.351
Solubility1.04×10−25 g/100 ml water
(Ksp at 25 °C = 2×10−32)[1]
References[2][3][4][5]

Cinnabar generally occurs as a vein-filling mineral associated with recent volcanic activity and alkaline hot springs. The mineral resembles quartz in symmetry and in its exhibiting birefringence. Cinnabar has a mean refractive index near 3.2, a hardness between 2.0 and 2.5, and a specific gravity of approximately 8.1. The color and properties derive from a structure that is a hexagonal crystalline lattice belonging to the trigonal crystal system, crystals that sometimes exhibit twinning.

Cinnabar has been used for its color since antiquity in the Near East, including as a rouge-type cosmetic, in the New World since the Olmec culture, and in China since as early as the Yangshao culture, where it was used in coloring stoneware.

Associated modern precautions for use and handling of cinnabar arise from the toxicity of the mercury component, which was recognized as early as ancient Rome.

Etymology

The name comes from Ancient Greek: κιννάβαρι[6] (kinnabari),[7] a Greek word most likely applied by Theophrastus to several distinct substances.[6] Other sources say the word comes from the Persian: شنگرف‎ shangarf (Arabicized as زنجفرة zinjifra), a word of uncertain origin. In Latin, it was sometimes known as minium, meaning also "red cinnamon", though both of these terms now refer specifically to lead tetroxide.[8]

Properties and structure

Properties

Cinnabar is generally found in a massive, granular or earthy form and is bright scarlet to brick-red in color, though it occasionally occurs in crystals with a nonmetallic adamantine luster.[9][10] It resembles quartz in its symmetry. It exhibits birefringence, and it has the second highest refractive index of any mineral.[11] Its mean refractive index is 3.08 (sodium light wavelengths),[12] versus the indices for diamond and the non-mineral gallium(III) arsenide (GaAs), which are 2.42 and 3.93, respectively. The hardness of cinnabar is 2.0–2.5 on the Mohs scale, and its specific gravity 8.1.[5]

Structure
Crystal structure of cinnabar: yellow = sulfur, grey = mercury, green = cell

Structurally, cinnabar belongs to the trigonal crystal system.[5] It occurs as thick tabular or slender prismatic crystals or as granular to massive incrustations.[3] Crystal twinning occurs as simple contact twins.[4]

Note, mercury(II) sulfide, HgS, adopts the cinnabar structure described, and one additional structure, i.e. it is dimorphous.[13] Cinnabar is the more stable form, and is a structure akin to that of HgO: each Hg center has two short Hg−S bonds (each 2.36 Å), and four longer Hg···S contacts (with 3.10, 3.10, 3.30, and 3.30 Å separations). In addition, HgS is found in a black, non-cinnabar polymorph (metacinnabar) that has the zincblende structure.[4]

Occurrence
Cinnabar mercury ore from Nevada, United States

Cinnabar generally occurs as a vein-filling mineral associated with recent volcanic activity and alkaline hot springs. Cinnabar is deposited by epithermal ascending aqueous solutions (those near surface and not too hot) far removed from their igneous source. It is associated with native mercury, stibnite, realgar, pyrite, marcasite, opal, quartz, chalcedony, dolomite, calcite and barite.[3]

Cinnabar is essentially found in all mineral extraction localities that yield mercury, notably Almadén (Spain). This mine was exploited from Roman times until 1991, being for centuries the most important cinnabar deposit in the world. Good cinnabar crystals have also been found there.[14][15] Cinnabar deposits also appear in Giza (Egypt); Puerto Princesa (Philippines); New Almaden (California); Hastings Mine and St. John's Mine, Vallejo, California (United States);[16] Idrija (Slovenia); New Idria, California (United States); Moschellandsberg near Obermoschel in the Palatinate; La Ripa, at the foot of the Apuan Alps and in the Mount Amiata (Tuscany, Italy); the mountain Avala (Serbia); Huancavelica (Peru); Murfreesboro, Arkansas (United States); Terlingua, Texas (United States); and the province of Guizhou in China, where fine crystals have been obtained. It was also mined near Red Devil, Alaska on the middle Kuskokwim River. Red Devil was named after the Red Devil cinnabar mine, a primary source of mercury. It has been found in Dominica near its sulfur springs at the southern end of the island along the west coast.

Cinnabar is still being deposited at the present day, such as from the hot waters of Sulphur Bank Mine in California and Steamboat Springs, Nevada.

Cinnabar crystals of an individual size of one centimeter, on quartz. Almadén (Ciudad Real) Spain. Coll. Museum of the School of Mining Engineers of Madrid.

Mining and extraction of mercury
Apparatus for the distillation of cinnabar, Alchimia, 1570

As the most common source of mercury in nature,[17] cinnabar has been mined for thousands of years, even as far back as the Neolithic Age.[18] During the Roman Empire it was mined both as a pigment,[19][20] and for its mercury content.[20]:XLI

To produce liquid mercury (quicksilver), crushed cinnabar ore is roasted in rotary furnaces. Pure mercury separates from sulfur in this process and easily evaporates. A condensing column is used to collect the liquid metal, which is most often shipped in iron flasks.

Toxicity
See also: Mercury poisoning

Associated modern precautions for use and handling of cinnabar arise from the toxicity of the mercury component, which was recognized as early as in ancient Rome.[21] Because of its mercury content, cinnabar can be toxic to human beings. Overexposure to mercury, mercurialism, was seen as an occupational disease to the ancient Romans. Though people in ancient South America often used cinnabar for art, or processed it into refined mercury (as a means to gild silver and gold to objects) the toxic properties of mercury were well known. It was dangerous to those who mined and processed cinnabar; it caused shaking, loss of sense, and death. Data suggests that mercury was retorted from cinnabar and the workers were exposed to the toxic mercury fumes.[22] "Mining in the Spanish cinnabar mines of Almadén, 225 km (140 mi) southwest of Madrid, was regarded as being akin to a death sentence due to the shortened life expectancy of the miners, who were slaves or convicts."[23]

Decorative use

Cinnabar has been used for its color since antiquity in the Near East, including as a rouge-type cosmetic,[21] in the New World since the Olmec culture, and in China for writing on Oracle bones as early as the Zhou dynasty. Later in the Song dynasty it was used in coloring lacquerware.

Cinnabar's use as a color in the New World, since the Olmec culture,[24] is exemplified by its use in royal burial chambers during the peak of Maya civilization, most dramatically in the 7th-century Tomb of the Red Queen in Palenque, where the remains of a noble woman and objects belonging to her in her sarcophagus were completely covered with bright red powder made from cinnabar.[25]

The most popularly known use of cinnabar is in Chinese carved lacquerware, a technique that apparently originated in the Song dynasty.[26] The danger of mercury poisoning may be reduced in ancient lacquerware by entraining the powdered pigment in lacquer,[27] but could still pose an environmental hazard if the pieces were accidentally destroyed. In the modern jewellery industry, the toxic pigment is replaced by a resin-based polymer that approximates the appearance of pigmented lacquer.

Chinese carved cinnabar lacquerware, late Qing dynasty. Adilnor Collection, Sweden.

Two female mummies dated A.D. 1399 to 1475 found in Cerro Esmeralda in Chile in 1976 had clothes colored with cinnabar.[28]

Other forms

See also

References
  1. Myers, R. J. (1986). "The new low value for the second dissociation constant of H2S. Its history, its best value, and its impact on teaching sulfide equilibria". Journal of Chemical Education. 63: 689.
  2. "Cinnabar". Mineralienatlas.
  3. "Cinnabar (HgS)" (PDF). rruff.geo.arizona.edu. Retrieved 2015-07-24.
  4. "Cinnabar: Cinnabar mineral information and data". Mindat. Retrieved 2015-07-24.
  5. "Cinnabar Mineral Data". Webmineral. Retrieved 2015-07-24.
  6. Chisholm, Hugh, ed. (1911). "Cinnabar" . Encyclopædia Britannica. 6 (11th ed.). Cambridge University Press. p. 376.
  7. "Cinnabar". Online Etymology Dictionary. Retrieved 2012-05-22.
  8. Thompson, Daniel V. (1956). The Materials and Techniques of Medieval Painting. Chicago, IL: Dover (R. R. Donnelley-Courier). pp. 100–102.
  9. King, R. J. (2002). "Minerals Explained 37: Cinnabar". Geology Today. 18 (5): 195–199. doi:10.1046/j.0266-6979.2003.00366.x.
  10. Klein, Cornelis; Hurlbut, Cornelius S., Jr (1985). Manual of Mineralogy (20th ed.). Wiley. p. 281. ISBN 0-471-80580-7.
  11. "Table of Refractive Indices and Double Refraction of Selected Gems - IGS". International Gem Society. Retrieved 2020-01-22.
  12. Schumann, W. (1997). Gemstones of the World. New York, NY: Sterling. ISBN 0-8069-9461-4.
  13. Wells, A. F. (1984). Structural Inorganic Chemistry. Oxford, Oxon: Clarendon Press. ISBN 0-19-855370-6.
  14. Calvo, Miguel (2003). Minerales y Minas de España. Vol. II. Sulfuros y sulfosales. Vitoria, Spain: Sulfuros y sulfosales. Museo de Ciencias Naturales de Alava. pp. 355–359. ISBN 84-7821-543-3.
  15. "Cinnabar. Spain". Mindat.
  16. Hogan, C. Michael; Papineau, Marc; et al. (Sep 1989). Environmental Assessment of the Columbus Parkway Widening between Ascot Parkway and the Northgate Development, Vallejo (Report). Earth Metrics Inc. Report 7853. California State Clearinghouse.
  17. "Natural Sources: Mercury". Environment Canada. Retrieved 2015-07-24.
  18. Martín Gil, J.; Martín Gil, F. J.; Delibes de Castro, G.; Zapatero Magdaleno, P.; Sarabia Herrero, F. J. (1995). "The first known use of vermillion". Experientia. 51 (8): 759–761. doi:10.1007/BF01922425. ISSN 0014-4754. PMID 7649232. S2CID 21900879.
  19. Vitruvius. De architectura. VII. 4–5.
  20. Pliny. Natural History. XXXIII. 36–42.
  21. Stewart, Susan (2014). "'Gleaming and deadly white': Toxic cosmetics in the Roman world". In Wexler, Philip (ed.). History of Toxicology and Environmental Health: Toxicology in Antiquity. II. New York, NY: Academic Press. p. 84. ISBN 978-0-12-801634-3. Retrieved 2015-07-24.
  22. Petersen, G. (2010). Mining and Metallurgy in Ancient Peru. Special Paper 467. Boulder, CO: The Geological Society of America. p. 29.
  23. Hayes, A. W. (2014). Principles and Methods of Toxicology (6th ed.). New York, NY: Informa Healthcare. p. 10. ISBN 978-1-842-14537-1.
  24. "New World's Oldest". Time Magazine. 1957-07-29.
  25. Healy, Paul F.; Blainey, Marc G. (2011). "Ancient Maya mosaic mirrors: Function, symbolism, and meaning". Ancient Mesoamerica. 22 (2): 230. doi:10.1017/S0956536111000241.
  26. Rawson, Jessica, ed. (2007). The British Museum Book of Chinese Art (2nd ed.). British Museum Press. p. 178. ISBN 9780714124469.
  27. Dietrich, R. V. (2005). "Cinnabar". Gemrocks: Ornamental & Curio Stones. Ann Arbor, MI: University of Michigan.
  28. "Dressed to Kill: Chilean Mummies' Clothes Were Colored with Deadly Toxin". livescience.com.
  29. "Hepatic Cinnabar: Hepatic Cinnabar mineral information and data". mindat.org.
  30. Shepard, Charles Upham (1832). Treatise on Mineralogy. Hezekiah Howe. p. 132.
  31. "Hypercinnabar: Hypercinnabar mineral information and data". Mindat.
  32. "Metacinnabar: Metacinnabar mineral information and data". Mindat.
  33. Holleman, A. F.; Wiberg, E. (2001). Inorganic Chemistry. San Diego, CA: Academic Press. ISBN 0-12-352651-5.

Further reading
  • Stewart, Susan (2014). "'Gleaming and deadly white': Toxic cosmetics in the Roman world". In Wexler, Philip (ed.). History of Toxicology and Environmental Health: Toxicology in Antiquity. II. New York, NY: Academic Press. p. 84. ISBN 978-0-12-801634-3.
  • Barone, G.; Di Bella, M.; Mastelloni, M. A.; Mazzoleni, P.; Quartieri, S.; Raneri, S.; Sabatino, G.; Vailati, C. (2016). Pottery Production of the Pittore di Lipari: Chemical and Mineralogical Analysis of the Pigments. Minerals, Fluids and Rocks: Alphabet and Words of Planet Earth. Rimini: 2nd European Mineralogical Conference (EMC2016) 11–15 Sep 2016. p. 716.
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